Electrical system



Sept. 2, 1930., a. LBEcKER 1,774,958

I ELECTRICAL SYSTEM I F1166. Jan. 3, 1927 Fig. 1.

' I MIMI:

Inventor-z Howard 1. Becker;

WWW

His Attorngy r, LCOMPIANYQAV conrona'rro nior,nnwxonx' simm r: sizsrimfI c Y .w application'filed YJanuary s, 1927. Serial no; 158,441,

' My ii ntienfieiate wei ht-5651 syste 's back c011.

systems has heretofore involved the difficulty f r Fig. -1 illustratescaV tenna-l and a telephone 2 are interconnected;

. and algrid 7 "which.

the current andan anode is controlledibyfineans 'of a grid r orcontrol:Blectrode, and' hasfor its fpriiicipal obj ecttheprovi sioii oii an improved arrange: i for controlling the interaction betweencoupling relation *to each change in the frequency 0 I transformersource 5, and an impedance device,

'coinprisingla spacejdischargeidevicewherein transmitted between facathode ment I I the grid and anodecircuits OfSLIClII ClGVICGSVariousregenerative systemsh'ave been provided in the past wherein thegrid and anode circuitsof a space discharge device are coupled togetherthrough The satisfactory operation of such that :the feed-back coil mustbe adjusted for f t-he potential applied to the 'grid circuit of thespace dis: charge device. vention, this vision of means-whereby theproportion of the anode current transmitted through thefeed-backis-varied inversely asthe frequency I 'the'resistor 12tend-s-todecrease; This-:varig of the grids potential.

y from the following description whenco'nsid ered in connection: withthe accompanying drawings'and its scope will be pointed out in theappended claims. c -c c. I

Referring to the drawings, Figs. '1' and 2 illustrate regenerativereceiving systems wherein myiinvent on has beenfe nbodied; V i,

system wherein an 'an'-,

' through means comprising a transformer 3,

i,- and a sourceof current shown as. abattery 5; The space disdevice aspace discharge charge deviceit isiorovided' with 'acathode 6 through atunedcircuit comprising an adjustable condenser .8 and afwinding9 of the3 andwith an anode 10 which is connected to the cathode '6 through thesource 5, thetelephone 2 and a feed-back' coil 10 'whereby the circuitsof the grid 7 and the anode 10 are coupled together. A condenser 11 isprovided for shuntingithe high frequency current past the telephone 2and shown as a resistor 12, is provided for=rendering-the couplingbetween thejgridcirciiitand the "It will be apparentgthat I a tickler101': feed-' In accordance with my in- I v in'itted "throughth'eresistor will' increase;

Likewise,

invention will befbetter v understood j are interconnected -sistancewhich is substantially zero;

of the feedback couplingn'iejans, namely -jthev, 'coupling1jcoil andthe; impedance device, "are fixed o if iotmanuallygvari'ableinrimpedance] 1 or resistance value, and thcrcoil is in a'gffixedsupplies feedback energy, J

the system respond to voltage of agfrequencydependent the 'circiit'tofwhich a:

-on theadjustinentofthe conjdens'er8; Thus 1 assuming the adjustmentg'of this condenser itoibesovariedthat potential of'an increasing-frequency s applied to thegrid'Z theipart of the anode current which istransmitted through the feedback coil 10? will decrease W when thefrequency ofthe grid potential is decreasedr the currentthroughthe andthe part of the-current which 'i's-trans c i i I coil 10 wtendstoincrease and"that throughv impedance of the coil',and :the impedance c.valueof the device connected in shunt there- 'E'with-andi-i-s of greatadvantage for thereaso'n that the feed-back energy, 'vwliichotherwisetends toincreaseiwith --frequency and cause j theg g'eneration ofoscillations T at high fr ei- I qll y,

variation in the magnitudei of the current transmitted throughtheresistor 12, it is de-* rial having a temperature coeflicient of i re"'Fig. 2 shows asys'tern which 's identical I is maintainedsubstantiallyiconstant. Inorder that-thefeed backcoupling beu'naffectedby temperature changesproduced by sir-able v'thatthis' resistor be madeof armatewith that of Fig. 1 except that a vcondenser 13 has been shownas connected in series with the resistor12. This type ofshuntconcnectionihas the'advantage thatits'combined impedance is readily'madeof sucha value i the current of the coil] 10* indeof the grid jpotentialfrequency.

as 'tokee pendent Thiscurrent-shoul'd ofcourse be 'just large enoughtoma'intain the tuned circuit of the grid insucha state'that it is justready to break into oscillation but is not caused to oscillate by thefeed-back current. In both embodiments of the invention the resistor 12is the controlling element of the impedance device,'its action in theembodimentishown nFig. 2 being l1m1ted by the introduction fof theserles condenser, the

, combined impedance of the condenser and 10.

' generation.

resistor then effecting the control of the re Ineither embodiment theim*-' pedance' device is of fixed value."v l i 1 The embodiments of theinventionillustrated and described herein have been se lectedfor thepurpose of clearly setting forth the principles involved; i. r t will beapparz 1 mt, howeventhat the invention-sis susceptible of'beingmodifiedto meetthe difierent conditions encountered. in 'its useand I therefore aimjto cover by the appended-claims all modificationswithin the true spirit and scope of iny 1nvent1on-.-

What I'claim as new anddesire to'secure V i by LettersPatent of theUnited States is: asv

LVThe combination of'a space discharge device provided with grid andanode cir-.

cuits, means providing a fixed feed back coupling between said grld andanode circuits,and fixed means connected in shunt to 'saidfeed backcoupling means of such impedance value with respect to that of said handthis l impedance of said feedback coil that the 'proportionof the anodecurrent which flows through the feed back coil varies inversely with thefrequency of the potential applied tothe grid circuit and therebymaintains the energy feed back substantially constant and independent ofthe frequency supplied to the grid circuit.

In Witness whereof, I have hereunto set 31st day of December, 1926..HOWARD I BECKER.

'cou lingmeans that the cou' lin between 5 i the grid and anodeicircuitsis rendered substantially independent of the operatingfrequency of the grid'circuit.

'2. The'combination of a space discharge device provided with grid andanode circuits,

a fixed feed back coil'providing a coupling between said circuits, and afixed resistor connected in shunt to said feed back coil, the

impedance of said resistor and of said coil being so related thatthecoupling between the grid and anode circuits is substantially,

'device provided with grid and anode-.cir

the gridcir cuit. p a 3.The combination of a space discharge independentvof the operating frequency of J cuits, a feed-back coil connectedbetween said circuits, and means comprising a resistor and a condenserconnected in series with one an other and in shunt tosaid coil, saidshunt connection being so proportioned as to render theamount of energyfed back substantially independent of the ffrequency.

4. The combination of a space discharge -device havingjan anode circuitand a grid circuit which is tunable over a range of frequen cies, a feedback coil in the anode circuit which is coupled to the grid circuit by afixed couplinggand a fixed impedance device connected in shunt to saidfeed back coil, the impedance ofsaid last named device and of'saidcoilbeing sorelated that the coupling between the grid andanode circuits1

